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304 lines
7.4 KiB
304 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/sparc/mm/init.c |
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* |
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* Copyright (C) 1995 David S. Miller ([email protected]) |
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* Copyright (C) 1995 Eddie C. Dost ([email protected]) |
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* Copyright (C) 1998 Jakub Jelinek ([email protected]) |
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* Copyright (C) 2000 Anton Blanchard ([email protected]) |
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*/ |
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#include <linux/module.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/ptrace.h> |
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#include <linux/mman.h> |
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#include <linux/mm.h> |
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#include <linux/swap.h> |
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#include <linux/initrd.h> |
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#include <linux/init.h> |
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#include <linux/highmem.h> |
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#include <linux/memblock.h> |
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#include <linux/pagemap.h> |
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#include <linux/poison.h> |
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#include <linux/gfp.h> |
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#include <asm/sections.h> |
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#include <asm/page.h> |
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#include <asm/vaddrs.h> |
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#include <asm/setup.h> |
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#include <asm/tlb.h> |
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#include <asm/prom.h> |
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#include <asm/leon.h> |
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#include "mm_32.h" |
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unsigned long *sparc_valid_addr_bitmap; |
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EXPORT_SYMBOL(sparc_valid_addr_bitmap); |
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unsigned long phys_base; |
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EXPORT_SYMBOL(phys_base); |
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unsigned long pfn_base; |
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EXPORT_SYMBOL(pfn_base); |
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struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; |
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/* Initial ramdisk setup */ |
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extern unsigned int sparc_ramdisk_image; |
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extern unsigned int sparc_ramdisk_size; |
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unsigned long highstart_pfn, highend_pfn; |
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unsigned long last_valid_pfn; |
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unsigned long calc_highpages(void) |
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{ |
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int i; |
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int nr = 0; |
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for (i = 0; sp_banks[i].num_bytes != 0; i++) { |
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unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; |
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unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; |
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if (end_pfn <= max_low_pfn) |
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continue; |
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if (start_pfn < max_low_pfn) |
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start_pfn = max_low_pfn; |
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nr += end_pfn - start_pfn; |
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} |
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return nr; |
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} |
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static unsigned long calc_max_low_pfn(void) |
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{ |
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int i; |
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unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); |
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unsigned long curr_pfn, last_pfn; |
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last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; |
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for (i = 1; sp_banks[i].num_bytes != 0; i++) { |
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curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; |
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if (curr_pfn >= tmp) { |
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if (last_pfn < tmp) |
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tmp = last_pfn; |
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break; |
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} |
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last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; |
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} |
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return tmp; |
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} |
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static void __init find_ramdisk(unsigned long end_of_phys_memory) |
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{ |
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#ifdef CONFIG_BLK_DEV_INITRD |
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unsigned long size; |
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/* Now have to check initial ramdisk, so that it won't pass |
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* the end of memory |
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*/ |
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if (sparc_ramdisk_image) { |
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if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) |
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sparc_ramdisk_image -= KERNBASE; |
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initrd_start = sparc_ramdisk_image + phys_base; |
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initrd_end = initrd_start + sparc_ramdisk_size; |
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if (initrd_end > end_of_phys_memory) { |
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printk(KERN_CRIT "initrd extends beyond end of memory " |
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"(0x%016lx > 0x%016lx)\ndisabling initrd\n", |
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initrd_end, end_of_phys_memory); |
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initrd_start = 0; |
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} else { |
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/* Reserve the initrd image area. */ |
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size = initrd_end - initrd_start; |
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memblock_reserve(initrd_start, size); |
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initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; |
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initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; |
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} |
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} |
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#endif |
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} |
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unsigned long __init bootmem_init(unsigned long *pages_avail) |
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{ |
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unsigned long start_pfn, bytes_avail, size; |
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unsigned long end_of_phys_memory = 0; |
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unsigned long high_pages = 0; |
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int i; |
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memblock_set_bottom_up(true); |
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memblock_allow_resize(); |
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bytes_avail = 0UL; |
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for (i = 0; sp_banks[i].num_bytes != 0; i++) { |
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end_of_phys_memory = sp_banks[i].base_addr + |
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sp_banks[i].num_bytes; |
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bytes_avail += sp_banks[i].num_bytes; |
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if (cmdline_memory_size) { |
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if (bytes_avail > cmdline_memory_size) { |
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unsigned long slack = bytes_avail - cmdline_memory_size; |
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bytes_avail -= slack; |
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end_of_phys_memory -= slack; |
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sp_banks[i].num_bytes -= slack; |
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if (sp_banks[i].num_bytes == 0) { |
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sp_banks[i].base_addr = 0xdeadbeef; |
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} else { |
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memblock_add(sp_banks[i].base_addr, |
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sp_banks[i].num_bytes); |
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sp_banks[i+1].num_bytes = 0; |
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sp_banks[i+1].base_addr = 0xdeadbeef; |
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} |
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break; |
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} |
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} |
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memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes); |
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} |
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/* Start with page aligned address of last symbol in kernel |
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* image. |
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*/ |
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start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); |
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/* Now shift down to get the real physical page frame number. */ |
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start_pfn >>= PAGE_SHIFT; |
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max_pfn = end_of_phys_memory >> PAGE_SHIFT; |
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max_low_pfn = max_pfn; |
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highstart_pfn = highend_pfn = max_pfn; |
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if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { |
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highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); |
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max_low_pfn = calc_max_low_pfn(); |
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high_pages = calc_highpages(); |
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
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high_pages >> (20 - PAGE_SHIFT)); |
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} |
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find_ramdisk(end_of_phys_memory); |
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/* Reserve the kernel text/data/bss. */ |
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size = (start_pfn << PAGE_SHIFT) - phys_base; |
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memblock_reserve(phys_base, size); |
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memblock_add(phys_base, size); |
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size = memblock_phys_mem_size() - memblock_reserved_size(); |
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*pages_avail = (size >> PAGE_SHIFT) - high_pages; |
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/* Only allow low memory to be allocated via memblock allocation */ |
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memblock_set_current_limit(max_low_pfn << PAGE_SHIFT); |
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return max_pfn; |
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} |
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/* |
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* paging_init() sets up the page tables: We call the MMU specific |
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* init routine based upon the Sun model type on the Sparc. |
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* |
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*/ |
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void __init paging_init(void) |
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{ |
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srmmu_paging_init(); |
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prom_build_devicetree(); |
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of_fill_in_cpu_data(); |
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device_scan(); |
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} |
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static void __init taint_real_pages(void) |
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{ |
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int i; |
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for (i = 0; sp_banks[i].num_bytes; i++) { |
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unsigned long start, end; |
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start = sp_banks[i].base_addr; |
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end = start + sp_banks[i].num_bytes; |
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while (start < end) { |
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set_bit(start >> 20, sparc_valid_addr_bitmap); |
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start += PAGE_SIZE; |
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} |
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} |
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} |
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static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) |
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{ |
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unsigned long tmp; |
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#ifdef CONFIG_DEBUG_HIGHMEM |
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printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); |
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#endif |
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for (tmp = start_pfn; tmp < end_pfn; tmp++) |
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free_highmem_page(pfn_to_page(tmp)); |
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} |
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void __init mem_init(void) |
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{ |
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int i; |
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if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { |
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prom_printf("BUG: fixmap and pkmap areas overlap\n"); |
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prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", |
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PKMAP_BASE, |
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(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, |
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FIXADDR_START); |
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prom_printf("Please mail [email protected].\n"); |
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prom_halt(); |
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} |
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/* Saves us work later. */ |
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memset((void *)empty_zero_page, 0, PAGE_SIZE); |
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i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); |
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i += 1; |
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sparc_valid_addr_bitmap = (unsigned long *) |
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memblock_alloc(i << 2, SMP_CACHE_BYTES); |
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if (sparc_valid_addr_bitmap == NULL) { |
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prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); |
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prom_halt(); |
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} |
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memset(sparc_valid_addr_bitmap, 0, i << 2); |
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taint_real_pages(); |
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max_mapnr = last_valid_pfn - pfn_base; |
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high_memory = __va(max_low_pfn << PAGE_SHIFT); |
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memblock_free_all(); |
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for (i = 0; sp_banks[i].num_bytes != 0; i++) { |
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unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; |
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unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; |
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if (end_pfn <= highstart_pfn) |
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continue; |
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if (start_pfn < highstart_pfn) |
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start_pfn = highstart_pfn; |
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map_high_region(start_pfn, end_pfn); |
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} |
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} |
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void sparc_flush_page_to_ram(struct page *page) |
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{ |
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unsigned long vaddr = (unsigned long)page_address(page); |
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if (vaddr) |
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__flush_page_to_ram(vaddr); |
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} |
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EXPORT_SYMBOL(sparc_flush_page_to_ram);
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